Sustainable approach to the antifouling and corrosion inhibitive properties of Exopolysaccharide producing Rhizobium leguminosarum (Legume Root Nodule Associated Bacteria) on mild steel at low pH
S. Padmavathy, Baluchamy Tamilselvi, Shen-Ming Chen, D. S. Bhuvaneshwari, Tse-Wei Chen
Abstract
Rhizobium leguminosarum is isolated from legume root nodule of Vigna mungo and screened for exopolysaccharide production along with biofilm forming ability by bacterial attachment assay. The Rhizobium leguminosarum isolate is utilized for its anti-fouling potential against the fouling isolates like Bacillus sp. and explored as corrosion inhibitor between 293 K and 313 K temperatures at low pH. Adsorption isotherm models, electrochemical techniques (EIS and PPM), XRD, spectroscopic (UV-Vis and FT-IR) and surface morphological studies (FE-SEM - EDX and AFM) have confirmed the adherence and anticorrosive nature of Rhizobium leguminosarum isolate. Maximum at 298 K with the optimum concentration of 9 x 10 6 cfu/mL Rhizobium leguminosarum isolate explored its potential. Increase in concentration of Rhizobium leguminosarum isolate enhanced the charge transfer resistance. Polarization curves indicate the mixed type inhibiting property of Rhizobium leguminosarum isolate .